Although recent iPhone models have grown in size, Apple has worked hard to maintain a slender appearance, often at the expense of battery life. As a result, an entire cottage industry has developed for external battery packs capable of charging devices while on the go—but at least one of them can do a few other tricks as well.

Power in the pocket

Measuring 78 x 70 x 23 mm and weighing a hair over five ounces, the Emtec Power Connect U800 is a small, pocket-friendly block of dark grey plastic. Inside is a 5200 mAh Lithium-ion battery capable of supplying 1A output through a standard USB 2.0 port.

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